Password is "listen" and I have no idea how you are supposed to figure it out, I think I spent about an hour during 2 separate plays months apart checking file system after anomaly. Maybe something in audio files? I didn't check spectrograms but I also didn't notice any strange sounds that usually are result of such frequency manipulations. Maybe something in e-mails, I didn't revisit them after decompiling the game.
Also game is coded to just crash after password entered (I don't think there any useful info that is given before crash).